<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>边框</title>
</head>
<style>
    div{
        width: 200px;
        height: 200px;
    }
    #d1{
        border-width: 10px;
        border-color: blueviolet;
        border-radius: 20px;
       /* border-style: groove ridge double dotted;*/
        border-style: inset outset ridge groove;
    }
</style>
<body>
    <div id="d1"></div>
</body>
</html>